Grinding mill



May 1, 1923. I 1,453,408

J. P. RUTH. JR

GRINDING MILL Filed Nov. 29. 1921 Patented May 1, 1923.

entree STATES JOSEPH P. RUTH, JR., DENVER, COLORADO.

GRINDING- MILL.

Application filed November 29, 1921. Serial No. 518.507.

7 0 all whom it may concern:

Be it known that I, JOSEPH P. RUTH, Jr., a citizen of the United States, and a resident of the city and county of Denver, State of Colorado, have invented certain new and useful Improvements in Grinding Mills, of which the following is a specification in such full, clear, and exact terms as will enable others skilled in the art to make and use the same, reference being had to the accompanying drawing, forming a part hereof.

The object of the invention is to provide a rod or ball mill which shall be cheap, simple and eflicient.

The invention comprises a shell having a head, which preferably is tapered or frusto-conical, the head having an extension parallel to the axis of the shell which forms a journal adapted to work in a suitable bearing. On the discharge end the journal carries a discharge flange to conduct the pulp which leaves the mill through the throat provided by the hollow journal extension. A splash-door is removably carried by the flange so as to rotate with the mill, said door having a diameter at least as great as the diameter of said throat and preferably greater.

In the drawings: M

Fig. 1 is partially a side elevation and partially a vertical longitudinal section of a mill embodying the invention; and

Fig. 2 is an elevation of the discharge end with a portion of the splash-door broken away.

The mill is broken away in Fig. 1 to show internal construction. The shell carries liners 12 and has secured thereto a head 14 which is tapered outward from the mill interior in frusto-conical formation. Head 14 has an integral cylindrical extension 15 which is hollow to provide a discharge throat and at the same time serves as a journal which is carried in bearings 16, suitable shoulders 18 being employed to position the journal in the bearing. On the discharge end of the mill the journal extension carries a discharge flange 20.

For the purpose of eliminating splash. a door is provided to rotate with the mill, thisdoor being carried on bosses 26 mounted on flange 20 by means of bolts 28 or the like passing through the door and into the bosses. Handles 30 are provided on the door for convenient manipulation, and the door may be readily removed by withdrawing bolts 28. The bosses 26 are so arranged that the door when in operativeposition will be spaced from the flange 20 sufliciently for proper flow of the pulp leaving the mill. As shown the door is larger than flange 20 in diameter, but it will also eliminate splash satisfactorily if its diameter is smaller than that of the flange but at least as great as the internal diameter of the journal 15 which constitutes the discharge throat.

The head on the intake end of the mill also has a journal which is carried in bearings 36 and is hollow to receive feed supplied through a feeding device 38. The mill is conveniently driven through the medium on an annular gear 40 carried by the and light in weight, and when removed.

leaves the space in front of the mill entirely unobstructed.

I claim:

1. A tube mill comprising a drum having a frusto-conical discharge head with a hollow journal and a flaring discharge flange,

and a splash door secured to said drum, said door being spaced at equal distances from said flange and thereby forming a discharge opening extending entirely around the outer end of said flange, said doorbeing of greater diameter than said outer flange end. I

2. A tube mill comprising a drum having a frusto-conical discharge head with ahollow journal, a discharge throat and a flaring discharge flange, and a splash door secured to said head, said door being spaced at equal distances from said head and thereby forming a discharge opening extending entirely around the door, said door having a diameter greater than that of the discharge throat.

In testimony whereof, I aflix my signature.

' JOSEPH P. RUTH, .JR, 

